Combined chimney-cowl and ventilator.



PATENTED MAY 7, 1907.

D. WHITEHEADV COMBINED CHIMNEY GOWL AND VENTILATOR.

APPLIGATION FILED IAN.13.1906.

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UNITED STATES PATENT oEEroE.

DAVID WHITEHEAD, OF PERTH, WESTERN AUSTRALIA, AUSTRALIA, AS-

SIGN OR OF ONE-HALF TO HARRY ADAMS, OF PERTH, AUSTRALIA.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed January 18, 1906. Serial No. 295.869.

To all whom it may concern.-

Be it known that I, DAVID WHITEHEAD, a citizen of the Commonwealth of Australia, residing at St. Georges Terrace, Perth,Wes-t ern Australia, Australia, have invented certain new and useful Improvements in a Combined Chimney Cowl and Ventilator; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon,which form a part of this specification.

The object of this appliance is principally to provide an efiective remedy for smoky chimneys and irrespective of their position while the appliance is also usable as a ventilator and skylight, thereby combining by its construction an appliance which may be used for either of the three specific purposes.

One of the main advantages of the invention being that the parts are rendered easily detachable and thereby allowing of the appliance being thoroughly cleaned out from time to time. These above results are obtained by the use of an inverted hollow cone which is mounted in the cowl head in an easily removable manner while the latter in itself also made to be readily detachable from its base, with the result that both can be separately removed from each other and the whole appliance laid open for purposes of cleaning.

The construction of the appliance will now be explained in conjunction with the attached drawings in which Figure 1 is a sectional view and Fig. 2 a top plan.

The plain arrows denote the direction of the wind currents while the S arrow indicates the up travel of the smoke or heated or impure air.

Inthese figures a is the hollowinverted cone placed as shown over the mouth of the up shaft a said cone being held in position by means of three outwardly inclined stays (1 whose outer ends a fit or drop loosely into their pockets a which latter are riveted to the shell of the outer hood I). This hood as b is made of an ornamental design and held in position concentric with the up shaft by the outwardly inclined stays 6 The cone is provided with a carry away pipe 0 whose outer end a sits in an opening as 0 made in the up shaft. This pipe may either be made integral with the cone or secured thereto by top and bottom jam nuts as 0 The top of the hood is arranged at such a height that the deflected air currents when refracted will not strike against the hood but will freely pass away and over same.

Across the mouth of the hood I) and cone a is placed a meshed or open spaced conical protector as c which is secured at its rim 6 to the hood 6, the purpose of this cone is to prevent debris, leaves and such like from falling into the cone or up shaft.

The up shaft a is formed with the three open ended slotsf through which the holding bolts f pass and whereby the up shaft and cowl is detachably secured to its fixed base as f and which latter is built in to the chimney or roof. The cowl as a whole is dropped on to these bolts which are then tightly screwed up.

In operation of the appliance it is found that the greater the transverse or down draft of the wind as by striking off a wall or over a roof or object higher than the cowl, the greater is the resultant up draft or exhaust of the smoke or impure air, while an up air current passing between the walls of the hood I) and shaft a also causes the smoke or impure air to be drawn up and out as shown by the arrows while the inverted cone acts as a distributer for the smoke or impure air by splitting same up into radially ejected currents.

When the appliance is desired to be used as a ventilator and skylight the inverted cone a would be made of glass, so as to admit light to the space below.

What I do claim as my invention, and desire to secure by Letters Patent is The combination with a hollow shaft, of an inverted conical member mounted above the mouth of the shaft, a hood supporting the conical member mounted on the shaft and extending above and below the tops of the shaft and conical member, and forming air my invention, I have signed my name in passages between it and the shaft and conical presence of two subscribing Witnesses.

member a drain pipe leading from the bottom of the latter through the side of the shaft DAVID WHITEHEAD' 5 above the bottom of the hood, and a conical Witnesses:

screen mounted in the top of the hood. RICHARD SPARROW,

In testimony that I claim the foregoing as Ross EAST. 

